JP7258586B2 - Mobile station, relay node and communication control method - Google Patents

Description

The present invention relates to a mobile station that performs mobile communication in a mobile communication network, a relay node that is included in the mobile communication network and that relays data, and a communication control method that is an operation method thereof.

Information related to the IPv6 prefix and default router that the mobile device uses for communication in the mobile communication network is notified to the mobile device by an ICMPv6 RA (Router Advertisement) message from the PDN Gateway (PDN) when connecting to the PDN (Packet Data Network). be. In the RA message, the validity period of the default router, etc. is set. The P-GW transmits a new RA message to the mobile station within this valid period, so that the mobile station always holds valid information. This allows the mobile station to perform continuous communication. Transmission of RA messages is typically done periodically. The EPC (Evolved Packet Core) stipulates that the periodic transmission interval of the RA message is a time interval of 4.5 hours to 6 hours (see Non-Patent Document 1).

TS29.061

For a terminal such as a smart phone that performs constant communication, sending RA messages at the above intervals poses no problem. While terminals such as smartphones are used, in recent years, IoT (Internet of Things) devices that have mobile communication functions and use batteries as power sources are increasing due to the low power consumption of terminals accompanying the evolution of wireless technology. there is In some cases, IoT devices are required to operate for several years to 10 years without battery replacement. need to be reduced. For IoT devices that are designed to reduce power consumption by minimizing periodic communication, the power consumption associated with establishing and releasing wireless connections through periodic transmission of RA messages is expected to become a bottleneck in extending battery life. be.

SUMMARY OF THE INVENTION The present invention has been made in view of the above, and provides a mobile station, a relay node, and a communication apparatus capable of reducing power consumption of the mobile station by reducing periodic transmission and reception of information required for communication of the mobile station. The object is to provide a control method.

To achieve the above object, a mobile station according to the present invention is a mobile station that performs mobile communication in a mobile communication network, and is a relay node that relays data related to the mobile station from the mobile communication network. and establishes a bearer in the mobile communication network and moves based on the information contained in the message received by the message receiving unit. A communication unit that transmits and receives data via a mobile communication network, and a mobile device side control unit that requests the mobile communication network to stop sending messages and prohibits release of the bearer after the validity period has elapsed. In preparation, if there is data to be sent from the device itself via the mobile communication network after the validity period has elapsed, the message receiving unit will confirm that there is data to be sent from the device to the mobile communication network after the validity period has elapsed. is detected, requests transmission of a message to the mobile communication network via the bearer established by the communication unit, receives the message from the mobile communication network in response to the request, and moves after the validity period has elapsed. When there is data to be sent to the device itself via the cellular communication network, the message receiving unit receives a message from the mobile communication network via the bearer established by the communication unit, and the communication unit receives the message by the message receiving unit. Based on the information contained in the received message, it transmits and receives transmission data.

In order to achieve the above objects, a relay node according to the present invention is a relay node included in a mobile communication network and relaying data to a mobile device. A message transmitting unit that notifies itself as a relay node and transmits a message including information indicating the validity period of the relay node; and a bearer in a mobile communication network related to a mobile unit that transmits a message by the message transmitting unit. and the message sending unit receives a request to stop sending a message to the mobile communication network from a mobile device that sends a message, stops the transmission of the message to the mobile device, and suspends the message transmission to the mobile device. and a relay node side control unit that prohibits release of the bearer after the elapse of the validity period, and if there is data to be transmitted from the mobile device via the mobile communication network after the elapse of the valid period, the message transmission unit is controlled by the relay unit accepts a message transmission request from the mobile station via the bearer established by , transmits the message to the mobile station, and there is data to be sent to the mobile station via the mobile communication network after the validity period has elapsed In this case, the message transmitter transmits the message to the mobile station via the bearer established by the relay, and the relay relays the transmission data in response to the transmission of the message by the message transmitter.

According to the mobile station and the relay node according to the present invention, it is possible to perform communication related to the mobile station without sending and receiving periodic messages. In addition, the above can be realized without changing the message itself (for example, without changing the validity period framework of the default router set in the RA message). Therefore, according to the mobile station and the relay node according to the present invention, it is possible to reduce the power consumption of the mobile station by reducing the periodical transmission and reception of information necessary for communication of the mobile station.

By the way, the present invention can be described as the invention of the mobile station and the relay node as described above, and can also be described as the invention of the communication control method, which is the operation method thereof, as follows. These are substantially the same inventions with only different categories, and have similar actions and effects.

That is, the communication control method according to the present invention is a communication control method for operating a mobile device that performs mobile communication in a mobile communication network, and relays data relating to the mobile device from the mobile communication network. a message receiving step of notifying a relay node and receiving a message including information indicating the validity period of the relay node; establishing a bearer in a mobile communication network and receiving information contained in the message received in the message receiving step; a communication step of transmitting and receiving data via the mobile communication network based on the message, and a control step on the mobile station side of requesting the mobile communication network to stop sending the message and prohibiting release of the bearer after the valid period has passed. and when there is data transmitted from the device itself via the mobile communication network after the validity period has passed, in the message receiving step, there is no data transmitted from the device itself to the mobile communication network after the validity period has passed. detect that there is a message, request transmission of a message to the mobile communication network via the bearer established in the communication step, receive the message from the mobile communication network in response to the request, and after the valid period elapses in the message receiving step, the message is received from the mobile communication network via the bearer established in the communication step, and in the communication step, the message is received Transmission and reception of transmission data is performed based on the information contained in the message received in the step.

Further, a communication control method according to the present invention is a communication control method which is a method of operating a relay node included in a mobile communication network and relaying data, wherein a mobile device is provided with a relay node for relaying data relating to the mobile device. a message sending step of notifying the node as a relay node that performs the above and sending a message containing information indicating the validity period of the relay node; In the relay step of establishing and relaying data, and in the message transmission step, a request to stop transmission of the message to the mobile communication network is received from the mobile device transmitting the message, and the transmission of the message to the mobile device is stopped. a relay node side control step for prohibiting release of a bearer after the validity period has passed; When a message transmission request is received from a mobile device via an established bearer, the message is transmitted to the mobile device, and there is data to be sent to the mobile device via the mobile communication network after the validity period has elapsed. Second, in the message transmission step, the message is transmitted to the mobile device via the bearer established in the relay step, and in the relay step, transmission data is relayed according to the transmission of the message in the message transmission step.

ADVANTAGE OF THE INVENTION According to this invention, communication regarding a mobile station can be performed without transmitting/receiving a message regularly. Also, the above can be realized without changing the message itself from the conventional one. Therefore, according to the present invention, it is possible to reduce the power consumption of the mobile device by reducing the periodical transmission and reception of information required for communication of the mobile device.

1 is a diagram showing the configuration of a mobile station according to an embodiment of the present invention and a P-GW that is a relay node according to an embodiment of the present invention; FIG. FIG. 4 is a sequence diagram showing processing when a PDN connection is established, which is executed by the mobile device according to the embodiment of the present invention and the P-GW, which is the relay node according to the embodiment of the present invention; FIG. 4 is a sequence diagram showing processing when time has passed since PDN connection was established, which is executed by the mobile device according to the embodiment of the present invention and the P-GW that is the relay node according to the embodiment of the present invention; . FIG. 4 is a sequence diagram showing processing when data is transmitted from the mobile device to the PDN, which is executed by the mobile device according to the embodiment of the present invention and the P-GW that is the relay node according to the embodiment of the present invention; FIG. 4 is a sequence diagram showing processing when data is transmitted from the PDN to the mobile device, which is executed by the mobile device according to the embodiment of the present invention and the P-GW that is the relay node according to the embodiment of the present invention; 1 is a diagram showing hardware configurations of a mobile device according to an embodiment of the present invention and a P-GW that is a relay node according to an embodiment of the present invention; FIG.

Embodiments of a mobile device, a relay node, and a communication control method according to the present invention will be described in detail below with reference to the drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and overlapping descriptions are omitted.

In this embodiment, 4G LTE (Long Term Evolution) will be described as an example of a mobile communication (mobile phone) standard. FIG. 1 shows a mobile device (UE: User Equipment) 10 according to this embodiment and a P-GW 20 which is a relay node according to this embodiment. The mobile station 10 is a device that performs mobile communication in the mobile communication network 30 . The mobile device 10 is, for example, an IoT device attached to or incorporated in various devices and used for IoT. The mobile device 10 operates on a battery. As described above, IoT devices are required to operate for several to ten years without battery replacement, and reduction of power consumption due to communication is required. Note that the mobile device 10 may be a device other than an IoT device. The mobile device 10 may have functions that a normal mobile device has, in addition to the functions according to the present embodiment, which will be described later.

The P-GW 20 is a packet switch included in the mobile communication network 30. Specifically, it is a component of the core network of the mobile communication network 30 and a relay node that relays data related to the mobile device 10. be. P-GW 20 is a connection point with PDN 40 in mobile communication network 30 . Also, the P-GW transfers packets to the S-GW, which will be described later. That is, the P-GW 20 relays data between the mobile device 10 and the PDN 40. FIG. The PDN 40 is a destination network, such as the Internet. Also, the P-GW 20 allocates an IP address and performs QoS (Quality of Service) control, bearer setting control, etc. in cooperation with a PCRF (Policy and Charging Rules Function). The P-GW 20 may have functions normally provided to mobile devices in addition to the functions according to the present embodiment, which will be described later.

The mobile communication network 30 is a communication network that provides the mobile device 10 with mobile communication functions. The mobile communication network 30 has components other than the P-GW 20, and these components operate to provide the mobile device 10 with mobile communication functions. For example, the mobile communication network 30 includes nodes such as eNodeB, MME (Mobility Management Entity), S-GW (Serving Gateway), and PCRF as these components.

eNodeB is a base station in the mobile communication network 30 . The MME is a switch that accommodates eNodeBs and provides mobility control, bearer control functions, and the like. An S-GW is a serving packet switch that accommodates eNodeBs. The PCRF is a logic node that controls QoS and billing for user data transfer. Also, the mobile communication network 30 may include other components.

Next, functions of the mobile device 10 and the P-GW 20 according to this embodiment will be explained. As shown in FIG. 1, a mobile station 10 according to this embodiment comprises a message receiving section 11, a communication section 12, and a mobile station side control section 13. FIG.

The message receiving unit 11 is a functional unit that receives a message from the mobile communication network 30 that notifies a relay node that relays data related to the mobile communication device and that includes information indicating the effective period of the relay node. The message is specifically an RA message. The relay node notified by the RA message is P-GW 20 which is the default router of PDN 40 . The RA message is transmitted from the P-GW 20, for example, when the mobile device 10 establishes a PDN connection, which is a connection for transmitting and receiving data with the PDN 40 (when establishing a session, when assigning an IP address).

The PDN connection is made, for example, when the mobile station 10 performs location registration (attachment) to the mobile communication network 30 . When establishing a PDN connection, the mobile device 10 sends a PDN connection request including an APN (Access Point Name), which is information indicating the PDN of the connection destination stored in advance, to the mobile communication network 30 through mobile communication. Send to network. A PDN connection request sent from the mobile device 10 to the mobile communication network is sent to the P-GW 20 via the eNodeB, MME and S-GW. The PDN connection request transmitted from the mobile device 10 is specifically ESM_PDN Connectivity Request. The MME receives the ESM_PDN Connectivity Request. Upon receiving the ESM_PDN Connectivity Request, the MME transmits a GTPv2_Create Session Request, which is a PDN connection request within the mobile communication network 30, to the P-GW 20 via the S-GW. Upon receiving the signal, the P-GW 20 transmits a PDN connection request response and an RA message to the mobile station 10 . A PDN connection is established when the mobile device 10 receives the PDN connection request response.

The RA message sent from the P-GW 20 to the mobile device 10 is sent to the mobile device 10 via the S-GW and eNodeB. The message receiving section 11 outputs the received RA message to the communication section 12 .

The message receiving unit 11 can also request the P-GW 20 to transmit the RA message. The message receiving unit 11 transmits an RS (Router Solicitation) message as the request to the P-GW 20 .

The communication unit 12 is a functional unit that establishes a bearer in the mobile communication network 30 and transmits and receives data via the mobile communication network 30 based on information included in the RA message received by the message receiving unit 11. . The communication unit 12 receives the RA message from the message reception unit 11 .

The RA message contains information indicating P-GW 20 which is the default router of PDN 40 . The communication unit 12 performs communication (data transmission/reception with the PDN 40) using the P-GW 20 as a default router. The RA message also includes a prefix (IPv6 Prefix). The communication unit 12 (mobile device 10) generates an Interface ID by itself, and generates an IPv6 address from the prefix included in the RA message and the generated Interface ID. The communication unit 12 performs communication using the generated IPv6 address. The communication unit 12 manages the valid period (Router Lifetime) in which the P-GW 20 (the source of the RA message) is regarded as the default router and the valid period (Preferred Lifetime/Valid Lifetime) of the generated IPv6 address. When the valid period expires, the default router or IPv6 address cannot be used, and the communication unit 12 cannot perform communication.

The RA message includes Router Lifetime, Preferred Lifetime, and Valid Lifetime as information related to the validity period. Router Lifetime is the lifetime of the default router determined by the mobile device 10 by the RA message. In RFC4861, the maximum configurable value for Router Lifetime is 65,535 seconds.

The Preferred Lifetime is the time during which the mobile device 10 permits the prefix notified by the RA message as the source address of the IPv6 address during communication. If no new RA message is received within the recommended validity period, the mobile device 10 attempts to use an address other than the corresponding prefix as the source address during communication. However, if the mobile device 10 does not have any other suitable prefix, it uses the prefix whose recommended validity period has passed for communication.

Valid Lifetime is the time until the prefix notified by the RA message expires. If a new RA message is not received even after the validity period has passed, the mobile device 10 deletes the address of the corresponding prefix. In RFC4861, the maximum value that can be set for Preferred Lifetime and Valid Lifetime is Infinity. As described above, the validity period of an IPv6 address (prefix) can be set to infinity according to the standard. Therefore, in terms of the IPv6 address, once the mobile station 10 receives an RA message, it will not receive a new RA message. can communicate with each other.

On the other hand, since the valid period of the default router has an upper limit according to the standard, in terms of the default router, the mobile station 10 cannot perform communication after the valid period has passed. Therefore, the conventional mobile station receives a new RA message before the expiration of the default router. For example, according to Non-Patent Document 1, it is defined that the P-GW periodically transmits RA messages at intervals of 4.5 hours to 6 hours. That is, conventional mobile stations receive RA messages periodically. In this embodiment, the RA message used is the one recognized by the standard. Therefore, the lifetime of the default router has an upper limit. In this embodiment, the power consumption of the mobile device 10 is reduced by reducing the periodic transmission and reception of RA messages required for communication of the mobile device 10 .

The communication unit 12 establishes a PDN connection (session) as described above and performs communication. A PDN connection includes bearers between the mobile device 10 and the P-GW 20 . When data to be transmitted to the PDN 40 (uplink user data) is generated, the communication unit 12 transmits the data to the PDN 40 via the established PDN connection. When data (downlink user data) is transmitted from the PDN 40 to the mobile device, the communication unit 12 receives the data via the established PDN connection. Transmission and reception of user data between the communication unit 12 and the PDN 40 are performed via eNodeB, S-GW and P-GW 20 in the mobile communication network 30 .

When the validity period of the default router expires, the mobile device 10 cannot transmit or receive data to or from the PDN 40, but maintains the PDN connection (bearer) without releasing it. ), signals can be transmitted/received to/from the P-GW 20 via the PDN connection.

The mobile unit side control unit 13 is a functional unit that requests the mobile communication network 30 to stop transmission of the RA message and prohibits release of the bearer after the validity period of the default router has elapsed. For example, the mobile unit-side control unit 13 includes an RA reduction request requesting suspension of transmission of the RA message in the PDN connection request transmitted from the mobile unit 10 to the mobile communication network 30 . Specifically, the mobile unit side control unit 13 includes the RA reduction request in PCO (Protocol Configuration Options) or ePCO of the ESM_PDN Connectivity Request. The PCO is transparently transferred in the MME and S-GW on the route between the mobile device 10 and the P-GW 20 . If the RA message is not transmitted from the P-GW 20 based on the request and is not received by the mobile device 10, the mobile device 10 will not be able to transmit/receive data to/from the PDN 40 after the validity period of the default router has elapsed. Note that the RA reduction request may be transmitted at a preset timing other than when the PDN connection request is made.

Upon requesting the mobile communication network 30 to stop transmitting the RA message, the mobile station control section 13 causes the message receiving section 11 to stop transmitting the RS message. Since no RS message is transmitted, no RA message is transmitted from the P-GW 20 to the mobile device 10 in response to the transmission of the RS message.

When requesting the mobile communication network 30 to stop transmission of the RA message, the mobile unit side control unit 13 prohibits the communication unit 12 from releasing the PDN connection after the validity period of the default router has elapsed. The mobile device 10 can transmit and receive signals to and from the P-GW 20 by controlling the release prohibition. After the validity period of the default router has passed, the mobile device 10 transitions to the RA update waiting mode for the next communication trigger as follows.

If there is transmission data (uplink user data) from the mobile station 10 to the PDN 40 via the mobile communication network 30 after the validity period of the default router has elapsed (that is, in the RA update waiting mode triggered by the next communication) (uplink communication trigger), the transmission data is transmitted as follows. When uplink user data is generated in the mobile device 10, the message receiving unit 11 detects the generation of uplink user data and transmits an RA message to the mobile communication network 30 via the PDN connection maintained by the communication unit 12. request. That is, the message receiving unit 11 transmits the RS message to the P-GW 20 via the PDN connection. Since the wireless connection between mobile station 10 and mobile communication network 30 is also disconnected at this time, mobile station 10 establishes wireless connection with mobile communication network 30 before transmitting the RS message. Establishment, specifically processing of UE initiated Service Request between eNodeB, MME and S-GW. Further, the communication unit 12 buffers uplink user data received from the upper layer.

The message receiving unit 11 receives the RA message transmitted from the P-GW 20 in response to the transmission of the RS message. The message receiving section 11 outputs the received RA message to the communication section 12 . The communication unit 12 transmits uplink user data based on information included in the RA message received by the message reception unit 11 . That is, the communication unit 12 enables transmission of data to the PDN 40 by updating the lifetime of the default router with the RA message, and transmits the buffered uplink user data to the PDN 40 . Note that when a new RA message is received, an IPv6 address may be generated based on the RA message and the validity period of the IPv6 address may be managed (the same applies to the following).

If there is transmission data (downlink user data) from the PDN 40 to the mobile device 10 via the mobile communication network 30 after the validity period of the default router has elapsed (that is, in the RA update waiting mode triggered by the next communication) (downlink communication trigger), the relevant transmission data is received as follows. In this case, an RA message is sent from the P-GW 20 as described later. At this time, the wireless connection between the mobile device 10 and the mobile communication network 30 is also disconnected. Specifically, a NW-activated Service Request is processed among the eNodeB, MME and S-GW. The message receiving unit 11 receives the RA message transmitted from the P-GW20. The message receiving section 11 outputs the received RA message to the communication section 12 . The communication unit 12 receives downlink user data based on information included in the RA message received by the message reception unit 11 . That is, the communication unit 12 enables reception of data from the PDN 40 by updating the valid period of the default router with the RA message, and receives downlink user data transmitted from the P-GW 20 .

Further, as described above, when the expiration date of the default router is updated, the communication unit 12 can transmit transmission data (uplink user data) to the PDN 40 (for example, Ack of the application layer). The above are the functions of the mobile device 10 according to the present embodiment.

As shown in FIG. 1, the P-GW 20 according to the present embodiment comprises a message transmission section 21, a relay section 22, and a relay node side control section .

The message transmitting unit 21 is a functional unit that notifies the mobile device 10 of its own node 20 as a default router for the mobile device 10 and transmits an RA message containing information indicating the validity period of the default router. For example, the message transmitting unit 21 transmits an RA message when the mobile device 10 is connected to the PDN. Specifically, when the mobile device 10 is connected to the PDN, the P-GW 20 receives a PDN connection request from the mobile device 10 (GTPv2_Create Session Request from the S-GW). P-GW 20 transmits a PDN connection request response to the PDN connection request to mobile device 10 . The PDN connection request response transmitted from the P-GW 20 is transmitted to the mobile device 10 via the S-GW, MME and eNodeB. The PDN connection request response transmitted from the P-GW 20 is specifically a GTPv2_Create Session Response. The MME receives the GTPv2_Create Session Response via the S-GW. Upon receiving the GTPv2_Create Session Response, the MME transmits to the mobile device 10 an ESM_Activate Default EPS Bearer Context Request, which is a PDN connection request response to the mobile device 10 . A PDN connection is established when the mobile device 10 receives the PDN connection request response. Upon receiving the ESM_Activate Default EPS Bearer Context Request, the mobile device 10 transmits ESM_Activate Default EPC Bearer Context Accept, which is a response thereto, to the MME. In the P-GW 20 , when the PDN connection request response is transmitted, the message transmission unit 21 transmits the RA message to the mobile device 10 .

As will be described later, the message transmission unit 21 is controlled by the relay node side control unit 23 to prohibit the transmission of RA messages. If the message sending unit 21 is not under the control, the message sending unit 21 may periodically send the RA message so that the validity period of the default router in the mobile device 10 does not expire.

The relay unit 22 is a functional unit that establishes a bearer in the mobile communication network 30 associated with the mobile device 10 that transmits the RA message from the message transmission unit 21 and relays data. The relay unit 22 establishes a PDN connection (session) relating to the mobile device 10 as described above, and relays data between the mobile device 10 and the PDN 40 via the PDN connection.

The relay unit 22 receives data (uplink user data) addressed to the PDN 40 from the mobile device 10 via the PDN connection and transmits the data to the PDN 40 . The relay unit 22 receives data (downlink user data) addressed to the mobile device 10 from the PDN 40 and transmits the received data to the mobile device 10 via the PDN connection.

When the validity period of the default router indicated by the RA message sent to the mobile device 10 expires, the relay unit 22 cannot transmit or receive data to or from the mobile device 10, but the PDN connection (bearer) can be released. By storing the information related to the PDN connection (bearer), it is possible to transmit and receive signals to and from the mobile device 10 via the PDN connection.

The relay node control unit 23 receives a request from the mobile device 10 transmitting the RA message to the mobile communication network 30 to stop the transmission of the RA message by the message transmitting unit 21, and stops the transmission of the RA message to the mobile device 10. It is a functional part that cancels and prohibits the release of bearers after the validity period of the default router has elapsed. As described above, the request to stop transmission of the RA message is made by including the RA reduction request in the PDN connection request transmitted from the mobile device 10 to the P-GW 20, for example. When the relay node side control unit 23 receives the PDN connection request including the RA reduction request by the relay unit 22 , the relay node side control unit 23 receives a request to stop transmission of the RA message from the mobile device 10 . Upon receiving the request, the relay node side control unit 23 causes the message transmitting unit 21 to stop the periodic transmission of the RA message to the mobile station 10 . However, when PDN is connected, that is, the transmission of the first RA message is not stopped. If the RA message is not sent from the P-GW 20 and received by the mobile device 10 based on the request, the P-GW 20 will relay data between the mobile device 10 and the PDN 40 after the validity period of the default router has elapsed. cannot be performed.

The relay node-side control unit 23 holds the final transmission time of the RA message for the mobile device 10 and the validity period of the default router, that is, the expected expiration time of the validity period of the default router. The relay node control unit 23 prohibits the relay unit 22 from releasing the PDN connection after the valid period (expiration time) of the default router has passed. The P-GW 20 can transmit and receive signals to and from the mobile device 10 by controlling the release prohibition. After the validity period of the default router has passed, the P-GW 20 transitions to the RA update waiting mode for the next communication trigger as follows.

When a new RA message is transmitted from the message transmitting unit 21 as will be described later while the relay node side control unit 23 is performing the above control, the relay node side control unit 23 returns the RA message for the mobile station 10 held. Update the last send time and lifetime of the default router.

If there is transmission data (uplink user data) from the mobile station 10 to the PDN 40 via the mobile communication network 30 after the validity period of the default router has elapsed (that is, in the RA update waiting mode triggered by the next communication) (uplink communication trigger), the transmission data is relayed as follows. When uplink user data is generated in the mobile device 10 , the mobile device 10 requests the mobile communication network 30 to transmit an RA message via the PDN connection maintained by the relay unit 22 . That is, the mobile station 10 transmits an RS message to the P-GW 20 via the PDN connection. The message transmitting unit 21 receives an RS message from the mobile station 10 via the PDN connection and transmits an RA message to the mobile station 10 .

The mobile device 10 receives the RA message and transmits uplink user data based on the information included in the received RA message. That is, the mobile device 10 updates the effective period of the default router with the RA message to enable data transmission to the PDN 40 and transmits user data to the PDN 40 . The relay unit 22 receives the transmitted user data and transmits it to the PDN 40 . That is, the relay unit 22 relays transmission data according to transmission of the RA message by the message transmission unit 21 .

If there is transmission data (downlink user data) from the PDN 40 to the mobile device 10 via the mobile communication network 30 after the validity period of the default router has elapsed (that is, in the RA update waiting mode triggered by the next communication) (downlink communication trigger), the transmission data is relayed as follows. In this case, the relay unit 22 receives downlink user data from the PDN 40 . The message transmission unit 21 detects reception of the downlink user data and transmits an RA message to the mobile device 10 via the PDN connection maintained by the relay unit 22. FIG.

The mobile device 10 receives the RA message and transmits downlink user data based on the information included in the received RA message. That is, the mobile device 10 can receive data from the PDN 40 by updating the lifetime of the default router with the RA message. The relay unit 22 transmits the user data received from the PDN 40 to the mobile device 10 . That is, the relay unit 22 relays transmission data according to transmission of the RA message by the message transmission unit 21 . The above are the functions of the P-GW 20 according to this embodiment.

It is conceivable that not all P-GWs in the mobile communication network have the above-described functions of the P-GW 20 according to this embodiment. Therefore, when the P-GW receives an RA reduction request from the mobile device 10, it may determine whether its own node can respond to it (that is, whether or not the RA message can be reduced). If the P-GW can respond to the RA reduction request, that is, if the P-GW is the P-GW 20 according to the present embodiment, make a positive response to the RA reduction request and perform the RA reduction described above. conduct. If the P-GW cannot respond to the RA reduction request, that is, if the P-GW is not the P-GW 20 according to the present embodiment, it will respond negatively to the RA reduction request and perform the RA reduction described above. do not have. In this case, the P-GW periodically transmits the RA message, and the mobile station 10 also performs processing according to the periodic RA message as in the conventional case. Said affirmative or negative response is included in the PDN connection request response, for example. Specifically, PCO (Protocol Configuration Options) of GTPv2_Create Session Response includes information indicating a positive or negative response. The mobile device 10 holds the information.

In this way, RA message reduction negotiation may be performed between the mobile device 10 and the P-GW 20 . If the negotiation succeeds, that is, if the above affirmative response is given, the mobile device 10 and the P-GW 20 execute the functions according to the present embodiment described above, and if the negotiation fails, that is, the above , the mobile device 10 and the P-GW 20 perform periodic RA message transmission/reception and corresponding functions in the same manner as in the past.

Subsequently, using the sequence diagrams of FIGS. 2 to 5, a communication control method which is a process executed by the mobile device 10 and the P-GW 20 according to the present embodiment (operation method performed by the mobile device 10 and the P-GW 20) will be described. explain. First, the processing when a PDN connection is established will be described using the sequence diagram of FIG.

In the mobile device 10, the mobile device side controller 13 requests the mobile communication network 30 to stop transmitting the RA message. Further, the communication unit 12 performs processing for establishing a PDN connection including bearers. Specifically, the RA reduction request is included in the PDN connection request transmitted from the mobile device 10 to the P-GW 20 (S01, communication step, mobile device side control step). In the P-GW 20 , the relay node side control unit 23 accepts a request from the mobile device 10 to stop transmission of the RA message to the mobile communication network 30 . Further, the relay unit 22 performs processing for establishing a PDN connection including bearers. Specifically, the PDN connection request including the RA reduction request transmitted from the mobile device 10 to the P-GW 20 is received (S01, relay step, relay node side control step).

Subsequently, the P-GW 20 determines whether or not it can respond to the RA reduction request (S02). The P-GW 20 having the function according to this embodiment is judged to be able to respond to the RA reduction request, that is, to reduce the RA message. In this case, the P-GW 20 sends an affirmative response to the RA reduction to the mobile device 10 . Specifically, the fact is included in the PDN connection request response transmitted from the P-GW 20 to the mobile device 10 (S03).

A P-GW that does not have the function according to this embodiment cannot respond to the RA reduction request, that is, it is determined that the RA message will not be reduced. In this case, the P-GW sends a negative response to the RA reduction to the mobile device 10 . Specifically, the fact is included in the PDN connection request response transmitted from the P-GW to the mobile device 10 (S03).

The mobile device 10 receives the PDN connection request response. The mobile device 10 holds the response included in the PDN connection request response, that is, the information indicating whether or not RA reduction is possible (S04). If the affirmative response is given above, the following processing is performed. On the other hand, when the above negative response is given, the periodic transmission and reception of the RA message and the processing corresponding thereto are executed in the same manner as in the past (illustration and description in this case will be omitted).

Subsequently, in the P-GW 20, the message transmitting unit 21 transmits the RA message to the mobile station 10 (S05, message transmitting step). In the mobile device 10 to which the RA message has been transmitted, the RA message is received by the message receiving section 11 (S05, message receiving step). Subsequently, the communication unit 12 performs processing according to the RA message. Concretely, it is the setting of the IPv6 address and the default router. Through these processes, a PDN connection including bearers for the mobile device 10 is established. Further, the mobile device 10 can communicate with the PDN based on the set IPv6 address, default router, and the like. The above is the processing when the PDN connection is made.

Next, processing when time has passed since the PDN connection was established will be described using the sequence diagram of FIG. 3 . In the P-GW 20, when the RA message periodic transmission interval has passed since the transmission of the RA message (S11), control by the relay node side control unit 23 is performed (S12, relay node side control step). Specifically, the relay node control unit 23 controls the message transmitting unit 21 to stop transmitting the RA message to the mobile device 10 . Due to this control, no RA message is sent from the P-GW 20 to the mobile device 10 . Further, the relay node-side control unit 23 controls the relay unit 22 to prohibit release of the PDN connection after the validity period of the default router has elapsed. With this control, the P-GW 20 can transmit and receive signals to and from the mobile device 10 even after the validity period of the default router has elapsed. Note that the timing of control by the relay node-side control unit 23 does not necessarily have to be the timing described above, and may be any timing at which the above control can be performed. Subsequently, the P-GW 20 transitions to the RA update waiting mode for the next communication opportunity (S13).

In the mobile device 10, when the validity period of the default router has passed since the reception of the RA message (S21), control is performed by the mobile device side control section 13 (S22, mobile device side control step). Specifically, the mobile station control section 13 controls the message receiving section 11 to stop transmitting the RS message. With this control, no RS message is transmitted from the mobile device 10 to the P-GW 20 . Since no RS message is transmitted from the mobile device 10 to the P-GW 20, no RA message is transmitted from the P-GW 20 to the mobile device 10 in response to the transmission of the RS message. Further, the control section 13 on the mobile device side controls the communication section 12 to prohibit release of the PDN connection after the valid period of the default router has elapsed. With this control, the mobile device 10 can transmit and receive signals to and from the P-GW 20 even after the validity period of the default router has expired. It should be noted that the timing of the control by the mobile unit side control section 13 does not necessarily have to be the timing described above, and may be any timing at which the above control can be performed. Subsequently, the mobile device 10 transitions to the RA update waiting mode for the next communication opportunity (S23). After the validity period of the default router has passed, data transmission/reception between the mobile device 10 and the PDN 40 cannot be performed. The above is the processing when time has passed since the PDN connection was established.

Next, with reference to the sequence diagram of FIG. 4, processing is performed when data is transmitted from the mobile device 10 to the PDN 40 after the mobile device 10 and the P-GW 20 transition to the RA update waiting mode for the next communication trigger. When uplink user data is generated in the mobile device 10, the generation of uplink user data is detected by the message receiving section 11 (S31). Subsequently, the message receiving unit 11 transmits the RS message to the P-GW 20 via the PDN connection maintained by the communication unit 12 (S32, message receiving step). In the P-GW 20, the RS message is received by the message transmitting section 21 (S32, message transmitting step). Before transmitting the RS message, the mobile device 10 establishes a wireless connection with the mobile communication network 30, more specifically, processes a UE-initiated Service Request.

Subsequently, the RA message is transmitted to the mobile device 10 by the message transmission unit 21 (S33, message transmission step). In the mobile device 10, the RA message is received by the message receiving section 11 (S33, message receiving step). Subsequently, the communication unit 12 performs processing corresponding to the RA message (S34). Specifically, it is updating the lifetime of the default router. This processing enables data transmission and reception between the mobile device 10 and the PDN 40 . Subsequently, the upstream user data is transmitted to the P-GW 20 by the communication unit 12 (S35, communication step). In the P-GW 20, the relay unit 22 relays the upstream user data to the PDN 40 (S35, relay step). The above is the processing when data is transmitted from the mobile device 10 to the PDN 40 .

Next, using the sequence diagram of FIG. 5, the processing when data is transmitted from the PDN 40 to the mobile device 10 after the mobile device 10 and the P-GW 20 transition to the RA update waiting mode for the next communication opportunity. When downlink user data is transmitted from the PDN 40, the P-GW 20 receives the downlink user data by the relay unit 22 (S41, relay step). Subsequently, the message transmitting unit 21 transmits the RA message to the mobile device 10 via the PDN connection maintained by the relay unit 22 (S42, message transmitting step). Before transmitting the RA message, the mobile station 10 establishes wireless connection with the mobile communication network 30, more specifically, processes NW-activated Service Request. In the mobile station 10, the RA message is received by the message receiving section 11 (S42, message receiving step). Subsequently, the communication unit 12 performs processing corresponding to the RA message (S43). Specifically, it is updating the lifetime of the default router. This processing enables data transmission and reception between the mobile device 10 and the PDN 40 .

Subsequently, in the P-GW 20, the relay unit 22 transmits downlink user data to the mobile device 10 (S45, relay step). In the mobile device 10, the downlink user data is received by the communication unit 12 (S45, communication step). The above is the processing when data is transmitted from the PDN 40 to the mobile device 10 .

According to this embodiment, communication related to the mobile device 10, specifically, communication between the mobile device 10 and the PDN 40 can be performed without periodically transmitting and receiving RA messages. In addition, the above can be realized without changing the RA message itself (for example, without changing the validity period framework of the default router set in the RA message). Therefore, according to this embodiment, it is possible to reduce the power consumption of the mobile device 10 by reducing the periodical transmission and reception of information necessary for communication of the mobile device 10 . This can bring about the effect of increasing the use of IPv6 in IoT applications that require ultra-low power consumption.

In the above-described embodiment, the request to stop transmission of the RA message is made uniformly at preset timings, but the following configuration may be adopted. The mobile unit side control unit 13 may request the mobile communication network 30 to stop transmitting the RA message according to the communication status of the communication unit 12 . In this case, the mobile unit side control unit 13 does not transmit the RA reduction request when PDN is established. The mobile unit side control unit 13 monitors, as the communication status of the communication unit 12, for example, the usage status of user data communication after the PDN is established. Examples of the usage status include the amount of data communication per unit time, the number of wireless connection establishments per unit time, and the like. The mobile unit side control unit 13 transmits an RA reduction request when the communication status by the communication unit 12 is so low that periodic transmission and reception of RA messages is unnecessary. For example, the mobile unit-side control unit 13 transmits an RA reduction request when the value indicating the usage status is equal to or less than a predetermined reference value. According to this configuration, the power consumption of the mobile device 10 can be reduced more appropriately.

In this embodiment, the messages to be reduced are RA messages, but messages other than RA messages may be reduced as long as they have the same framework. Further, in this embodiment, the relay node according to the present embodiment is the P-GW 20, but any relay node other than the P-GW 20 may be used as the relay node according to the present invention as long as it is a relay node in the same framework. .

Also, in the present embodiment, 4G LTE has been described as an example, but 2G/3G or 5G may also be used. In the case of 2G/3G, the MME and S-GW in this embodiment are SGSN (Serving GPRS Support Node), the P-GW 20 in this embodiment is GGSN (Gateway GPRS Support Node), and the eNodeB is RNC (Radio Network Controller) can be read as . In the case of 5G, the MME in this embodiment is AMF (Access and Mobility Management Function), the S-GW in this embodiment is UPF (User Plane. Function), and the P-GW 20 in this embodiment is SMF (Session Management Function ), eNodeB should be replaced with gNodeB. In the case of 5G, a signal may be directly transmitted and received between the AMF and the SMF when the PDN is established.

It should be noted that the block diagrams used in the description of the above embodiments show blocks in units of functions. These functional blocks (components) are realized by any combination of at least one of hardware and software. Also, the method of implementing each functional block is not particularly limited. That is, each functional block may be implemented using one device that is physically or logically coupled, or directly or indirectly using two or more devices that are physically or logically separated (e.g. , wired, wireless, etc.) and may be implemented using these multiple devices. A functional block may be implemented by combining software in the one device or the plurality of devices.

Functions include judging, determining, determining, calculating, calculating, processing, deriving, investigating, searching, checking, receiving, transmitting, outputting, accessing, resolving, selecting, choosing, establishing, comparing, assuming, expecting, assuming, Broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, etc. can't For example, a functional block (component) that makes transmission work is called a transmitting unit or a transmitter. In either case, as described above, the implementation method is not particularly limited.

For example, the mobile device 10 and P-GW 20 in one embodiment of the present disclosure may function as computers that perform the processing of the method of the present disclosure. FIG. 6 is a diagram showing an example of hardware configurations of the mobile device 10 and the P-GW 20 according to an embodiment of the present disclosure. The mobile device 10 and P-GW 20 described above may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like. .

Note that in the following description, the term "apparatus" can be read as a circuit, device, unit, or the like. The hardware configuration of the mobile device 10 and P-GW 20 may be configured to include one or more of each device shown in the figure, or may be configured without some of the devices.

Each function of mobile device 10 and P-GW 20 is implemented by loading predetermined software (program) onto hardware such as processor 1001 and memory 1002 so that processor 1001 performs calculations and controls communication by communication device 1004. or by controlling at least one of reading and writing data in the memory 1002 and the storage 1003 .

The processor 1001, for example, operates an operating system to control the entire computer. The processor 1001 may be configured by a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic device, registers, and the like. For example, each function in the mobile device 10 and P-GW 20 described above may be realized by the processor 1001. FIG.

The processor 1001 also reads programs (program codes), software modules, data, etc. from at least one of the storage 1003 and the communication device 1004 to the memory 1002, and executes various processes according to these. As the program, a program that causes a computer to execute at least part of the operations described in the above embodiments is used. For example, each function in mobile device 10 and P-GW 20 may be implemented by a control program stored in memory 1002 and running on processor 1001 . Although it has been explained that the above-described various processes are executed by one processor 1001, they may be executed simultaneously or sequentially by two or more processors 1001. FIG. Processor 1001 may be implemented by one or more chips. Note that the program may be transmitted from a network via an electric communication line.

The memory 1002 is a computer-readable recording medium, and is composed of at least one of, for example, ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM (Electrically Erasable Programmable ROM), and RAM (Random Access Memory). may be The memory 1002 may also be called a register, cache, main memory (main storage device), or the like. The memory 1002 can store executable programs (program code), software modules, etc. to perform a method according to an embodiment of the present disclosure.

The storage 1003 is a computer-readable recording medium, for example, an optical disc such as a CD-ROM (Compact Disc ROM), a hard disk drive, a flexible disc, a magneto-optical disc (for example, a compact disc, a digital versatile disc, a Blu-ray disk), smart card, flash memory (eg, card, stick, key drive), floppy disk, magnetic strip, and/or the like. Storage 1003 may also be called an auxiliary storage device. The storage medium described above may be, for example, a database, server, or other suitable medium including at least one of memory 1002 and storage 1003 .

The communication device 1004 is hardware (transmitting/receiving device) for communicating between computers via at least one of a wired network and a wireless network, and is also called a network device, a network controller, a network card, a communication module, or the like. The communication device 1004 includes a high-frequency switch, a duplexer, a filter, a frequency synthesizer, and the like, for example, in order to realize at least one of frequency division duplex (FDD) and time division duplex (TDD). may consist of For example, each function in the mobile device 10 and P-GW 20 described above may be realized by the communication device 1004. FIG.

The input device 1005 is an input device (for example, keyboard, mouse, microphone, switch, button, sensor, etc.) that receives input from the outside. The output device 1006 is an output device (eg, display, speaker, LED lamp, etc.) that outputs to the outside. Note that the input device 1005 and the output device 1006 may be integrated (for example, a touch panel).

Devices such as the processor 1001 and the memory 1002 are connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or may be configured using different buses between devices.

Further, the mobile device 10 and the P-GW 20 include hardware such as a microprocessor, a digital signal processor (DSP), an ASIC (Application Specific Integrated Circuit), a PLD (Programmable Logic Device), and an FPGA (Field Programmable Gate Array). hardware, and part or all of each functional block may be realized by the hardware. For example, processor 1001 may be implemented using at least one of these pieces of hardware.

Notification of information is not limited to the aspects/embodiments described in this disclosure, and may be performed using other methods. For example, notification of information includes physical layer signaling (e.g., DCI (Downlink Control Information), UCI (Uplink Control Information)), higher layer signaling (e.g., RRC (Radio Resource Control) signaling, MAC (Medium Access Control) signaling, It may be implemented by broadcast information (MIB (Master Information Block), SIB (System Information Block)), other signals, or a combination thereof. RRC signaling may also be called an RRC message, and may be, for example, an RRC connection setup message, an RRC connection reconfiguration message, or the like.

Each aspect/embodiment described in the present disclosure includes LTE (Long Term Evolution), LTE-A (LTE-Advanced), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system), 5G (5th generation mobile communication system), FRA (Future Radio Access), NR (new Radio), W-CDMA (registered trademark), GSM (registered trademark), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi (registered trademark) )), IEEE 802.16 (WiMAX®), IEEE 802.20, UWB (Ultra-WideBand), Bluetooth®, and other suitable systems and extended It may be applied to at least one of the next generation systems. Also, a plurality of systems may be applied in combination (for example, a combination of at least one of LTE and LTE-A and 5G, etc.).

The processing procedures, sequences, flowcharts, etc. of each aspect/embodiment described in this disclosure may be rearranged as long as there is no contradiction. For example, the methods described in this disclosure present elements of the various steps using a sample order, and are not limited to the specific order presented.

Information, etc., may be output from a higher layer (or lower layer) to a lower layer (or higher layer). It may be input and output via multiple network nodes.

Input/output information and the like may be stored in a specific location (for example, memory), or may be managed using a management table. Input/output information and the like can be overwritten, updated, or appended. The output information and the like may be deleted. The entered information and the like may be transmitted to another device.

The determination may be made by a value represented by one bit (0 or 1), by a true/false value (Boolean: true or false), or by numerical comparison (for example, a predetermined value).

Each aspect/embodiment described in the present disclosure may be used alone, may be used in combination, or may be used by switching according to execution. In addition, the notification of predetermined information (for example, notification of “being X”) is not limited to being performed explicitly, but may be performed implicitly (for example, not notifying the predetermined information). good too.

Although the present disclosure has been described in detail above, it should be apparent to those skilled in the art that the present disclosure is not limited to the embodiments described in this disclosure. The present disclosure can be practiced with modifications and variations without departing from the spirit and scope of the present disclosure as defined by the claims. Accordingly, the description of the present disclosure is for illustrative purposes and is not meant to be limiting in any way.

Software, whether referred to as software, firmware, middleware, microcode, hardware description language or otherwise, includes instructions, instruction sets, code, code segments, program code, programs, subprograms, and software modules. , applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, and the like.

Software, instructions, information, etc. may also be sent and received over a transmission medium. For example, the software uses wired technology (coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), etc.) and/or wireless technology (infrared, microwave, etc.) to create websites, Wired and/or wireless technologies are included within the definition of transmission medium when sent from a server or other remote source.

Information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may refer to voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any of these. may be represented by a combination of

The terms explained in this disclosure and the terms necessary for understanding the present disclosure may be replaced with terms having the same or similar meanings. For example, the channel and/or symbols may be signaling. A signal may also be a message. A component carrier (CC) may also be called a carrier frequency, a cell, a frequency carrier, or the like.

As used in this disclosure, the terms "system" and "network" are used interchangeably.

In addition, the information, parameters, etc. described in the present disclosure may be expressed using absolute values, may be expressed using relative values from a predetermined value, or may be expressed using other corresponding information. may be represented. For example, radio resources may be indexed.

The names used for the parameters described above are not limiting names in any way. Further, the formulas, etc., using these parameters may differ from those expressly disclosed in this disclosure. Since the various channels (e.g., PUCCH, PDCCH, etc.) and information elements can be identified by any suitable name, the various names assigned to these various channels and information elements are in no way restrictive names. isn't it.

In the present disclosure, "base station (BS)", "radio base station", "fixed station", "NodeB", "eNodeB (eNB)", "gNodeB (gNB)", " "access point", "transmission point", "reception point", "transmission/reception point", "cell", "sector", "cell group", " Terms such as "carrier", "component carrier" may be used interchangeably. A base station may also be referred to by terms such as macrocell, small cell, femtocell, picocell, and the like.

A base station may serve one or more (eg, three) cells. When a base station accommodates multiple cells, the overall coverage area of the base station can be partitioned into multiple smaller areas, each smaller area being associated with a base station subsystem (e.g., an indoor small base station (RRH: The term "cell" or "sector" refers to part or all of the coverage area of a base station and/or base station subsystem serving communication in this coverage. point to

In this disclosure, terms such as “Mobile Station (MS),” “user terminal,” “User Equipment (UE),” “terminal,” etc. may be used interchangeably. .

A mobile station is defined by those skilled in the art as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless It may also be called a terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable term.

At least one of a base station and a mobile station may be called a transmitter, a receiver, a communication device, and the like. At least one of the base station and the mobile station may be a device mounted on a mobile object, the mobile object itself, or the like. The mobile object may be a vehicle (e.g., car, airplane, etc.), an unmanned mobile object (e.g., drone, self-driving car, etc.), or a robot (manned or unmanned ). Note that at least one of the base station and the mobile station includes devices that do not necessarily move during communication operations. For example, at least one of the base station and the mobile station may be an IoT (Internet of Things) device such as a sensor.

Also, the base station in the present disclosure may be read as a user terminal. For example, communication between a base station and a user terminal is replaced with communication between multiple user terminals (for example, D2D (Device-to-Device), V2X (Vehicle-to-Everything), etc.) Regarding the configuration, each aspect/embodiment of the present disclosure may be applied. Also, words such as "up" and "down" may be replaced with words corresponding to inter-terminal communication (for example, "side"). For example, uplink channels, downlink channels, etc. may be read as side channels. Similarly, user terminals in the present disclosure may be read as base stations.

As used in this disclosure, the terms "determining" and "determining" may encompass a wide variety of actions. "Judgement", "determining" are, for example, judging, calculating, computing, processing, deriving, investigating, looking up, searching, inquiring (eg, lookup in a table, database, or other data structure), ascertaining as "judged" or "determined", and the like. Also, "judgment" and "determination" are used for receiving (e.g., receiving information), transmitting (e.g., transmitting information), input, output, access (accessing) (for example, accessing data in memory) may include deeming that a "judgment" or "decision" has been made. In addition, "judgment" and "decision" are considered to be "judgment" and "decision" by resolving, selecting, choosing, establishing, comparing, etc. can contain. In other words, "judgment" and "decision" may include considering that some action is "judgment" and "decision". Also, "judgment (decision)" may be read as "assuming", "expecting", "considering", or the like.

The terms "connected", "coupled", or any variation thereof, mean any direct or indirect connection or coupling between two or more elements, It can include the presence of one or more intermediate elements between two elements being "connected" or "coupled." Couplings or connections between elements may be physical, logical, or a combination thereof. For example, "connection" may be read as "access". As used in this disclosure, two elements are defined using at least one of one or more wires, cables, and printed electrical connections and, as some non-limiting and non-exhaustive examples, in the radio frequency domain. , electromagnetic energy having wavelengths in the microwave and optical (both visible and invisible) regions, and the like.

As used in this disclosure, the phrase "based on" does not mean "based only on," unless expressly specified otherwise. In other words, the phrase "based on" means both "based only on" and "based at least on."

Any reference to elements using the "first," "second," etc. designations used in this disclosure does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, reference to a first and second element does not imply that only two elements can be employed or that the first element must precede the second element in any way.

Where "include," "including," and variations thereof are used in this disclosure, these terms are inclusive, as is the term "comprising." is intended. Furthermore, the term "or" as used in this disclosure is not intended to be an exclusive OR.

In this disclosure, where articles have been added by translation, such as a, an, and the in English, the disclosure may include the plural nouns following these articles.

In the present disclosure, the term "A and B are different" may mean "A and B are different from each other." The term may also mean that "A and B are different from C". Terms such as "separate," "coupled," etc. may also be interpreted in the same manner as "different."

DESCRIPTION OF SYMBOLS 10... Mobile station 11... Message receiving part 12... Communication part 13... Mobile station side control part 20... P-GW 21... Message transmission part 22... Relay part 23... Relay node side control part 30 Mobile communication network 40 PDN 1001 Processor 1002 Memory 1003 Storage 1004 Communication device 1005 Input device 1006 Output device 1007 Bus.

Claims (5)

A mobile device that performs mobile communication in a mobile communication network,
a message receiving unit that receives a message from a mobile communication network that notifies a relay node that relays data related to the device itself and that includes information indicating the validity period of the relay node;
a communication unit that establishes a bearer in a mobile communication network and transmits and receives data via the mobile communication network based on information included in the message received by the message receiving unit ;
a mobile device side control unit that requests the mobile communication network to stop transmitting the message and prohibits release of the bearer established by the communication unit after the expiration of the valid period,
When there is data to be transmitted from the device itself via the mobile communication network after the expiration of the validity period, the message receiving unit has data to be transmitted from the device itself to the mobile communication network after the expiration of the validity period. detecting that, requesting transmission of the message to the mobile communication network via the bearer established by the communication unit, and receiving the message from the mobile communication network in response to the request ;
When there is data to be transmitted to the device itself via the mobile communication network after the expiration of the valid period, the message receiving unit receives the message from the mobile communication network via the bearer established by the communication unit. receive and
The mobile device, wherein the communication unit transmits and receives transmission data based on information included in the message received by the message reception unit. 2. The mobile device according to claim 1, wherein the mobile device side control unit requests the mobile communication network to stop transmitting the message according to the communication status of the communication unit. A relay node included in a mobile communication network and relaying data,
a message transmitting unit that notifies a mobile device of its own node as a relay node that relays data related to the mobile device and transmits a message that includes information indicating the validity period of the relay node;
a relay unit that establishes a bearer in a mobile communication network associated with a mobile device that transmits the message by the message transmission unit and relays data;
receiving a request from the mobile device transmitting the message to the mobile communication network to stop transmission of the message by the message transmitting unit, stopping the transmission of the message to the mobile device, and after the valid period elapses , a relay node-side control unit that prohibits release of the bearer established by the relay unit ;
When there is data to be transmitted from the mobile device via the mobile communication network after the expiration of the validity period, the message transmission unit is configured to prevent transmission of the message from the mobile device via the bearer established by the relay unit. receiving the request and transmitting the message to the mobile station;
When there is data to be transmitted to the mobile device via the mobile communication network after the expiration of the validity period, the message transmitting unit transmits the message to the mobile device via the bearer established by the relay unit. ,
The relay node, wherein the relay unit relays transmission data in accordance with transmission of the message by the message transmission unit. A communication control method for operating a mobile station that performs mobile communication in a mobile communication network,
a message receiving step of receiving a message from a mobile communication network that notifies a relay node that relays data relating to the mobile communication device and that includes information indicating the validity period of the relay node;
a communication step of establishing a bearer in a mobile communication network and transmitting and receiving data via the mobile communication network based on information included in the message received in the message receiving step ;
a mobile device side control step of requesting the mobile communication network to stop transmitting the message and prohibiting release of the bearer established in the communication step after the expiration of the validity period;
If there is data to be transmitted from the device via the mobile communication network after the valid period has elapsed, there is data to be sent from the device to the mobile communication network after the valid period has elapsed in the message receiving step. detecting that, requesting the mobile communication network to transmit the message via the bearer established in the communication step, and receiving the message from the mobile communication network in response to the request ;
when there is data to be transmitted to the mobile communication device via the mobile communication network after the expiration of the valid period, in the message receiving step, the message is transmitted from the mobile communication network via the bearer established in the communication step. receive and
The communication control method, wherein, in the communication step, transmission/reception of transmission data is performed based on information included in the message received in the message reception step. A communication control method, which is a method of operating a relay node included in a mobile communication network and relaying data,
a message transmission step of notifying a mobile station of itself as a relay node that relays data related to the mobile station and transmitting a message including information indicating the validity period of the relay node;
a relaying step of establishing a bearer in a mobile communication network associated with a mobile device that transmits the message in the message transmitting step and relaying data;
receiving a request from the mobile device transmitting the message to the mobile communication network to stop sending the message in the message sending step, stopping the transmission of the message to the mobile device, and after the expiration of the validity period , a relay node side control step for prohibiting release of the bearer established in the relay step ;
when there is data to be transmitted from the mobile device via the mobile communication network after the expiration of the validity period, in the message transmission step, transmission of the message from the mobile device via the bearer established in the relay step is delayed . receiving the request and transmitting the message to the mobile station;
when there is data to be transmitted to the mobile device via the mobile communication network after the expiration of the valid period, the message transmission step transmits the message to the mobile device via the bearer established in the relay step. ,
The communication control method, wherein, in the relay step, transmission data is relayed according to transmission of the message in the message transmission step.

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